Is a South Korean Manhwa writer. In Japan, he is known for his work of Blade of the Phantom Master. His previous work was on the manhwa Island (아일랜드) together with illustrator Yang Kyung-il. After the publication of the seventh and last volume of Island, he wrote a novel "The Island" in which he described the past of the characters in his manhwa. His debut was in the Korean weekly magazine Deja Vu (데자뷰).

To those that have read his work he is well known for weird comments at the end of every chapter, in Blade of the Phantom Master referred to as Classics. In omakes he is represented as being a lean bespectacled character. He is loud mouth, and brash, and often is shown leading his quiet illustrator, Yang, around.

After the success of their one shot "Akuma Bengoshi Kukabara" (悪魔弁護士Kukabara?, lit. "Devil Advocate Kukabara"), they have begun to work on Defense Devil for the weekly manga magazine Shonen Sunday.